added forgotten changes

include/villas/utils.h

@@ -176,6 +176,7 @@ char * cpulist_create(char *str, size_t len, cpu_set_t *set);
 json_t * config_to_json(config_setting_t *cfg);
 
 #endif
+int json_to_config(json_t *json, config_setting_t *parent);
 
 /** Allocate and initialize memory. */
 void * alloc(size_t bytes);

plugins/hooks/example_hook.c

@@ -14,10 +14,10 @@ struct hook;
 struct path;
 struct sample;
 
-static int hook_example(struct hook *h, int when, struct hook_info *j)
+static int example_start(struct hook *h)
 {
 	info("Hello world from example hook!");
-	
+
 	return 0;
 }
 
@@ -27,8 +27,7 @@ static struct plugin p = {
 	.type		= PLUGIN_TYPE_HOOK,
 	.hook		= {
 		.priority = 99,
-		.cb	= hook_example,
-		.when	= HOOK_PATH_START
+		.start	= example_start
 	}
 };